13424402921 has 2 divisors, whose sum is σ = 13424402922. Its totient is φ = 13424402920.

The previous prime is 13424402911. The next prime is 13424402969. The reversal of 13424402921 is 12920442431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11277378025 + 2147024896 = 106195^2 + 46336^2 .

It is a cyclic number.

It is not a de Polignac number, because 13424402921 - 2²⁶ = 13357294057 is a prime.

It is not a weakly prime, because it can be changed into another prime (13424402911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6712201460 + 6712201461.

It is an arithmetic number, because the mean of its divisors is an integer number (6712201461).

Almost surely, 2^13424402921 is an apocalyptic number.

It is an amenable number.

13424402921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13424402921 is an equidigital number, since it uses as much as digits as its factorization.

13424402921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 13424402921 in words is "thirteen billion, four hundred twenty-four million, four hundred two thousand, nine hundred twenty-one".